Shaft coupling for garden tools



FIG. 1 is a bottom plan view of a shaft coupling for garden tools showing our new design;

FIG. 2 is a side view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a rear elevation of the design; and

FIG. 5 is a front elevation thereof. 

The ornamental design for a shaft coupling for garden tools, as shown. 